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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b5f242b3b27158f573e6ba8a60cc561ea68ecd25b881ecbc25ec62ede5cb58' 
  AND token = 'eEjOR1Gsf7S8kb0wgt6cAZ30TpPPbuxdGM4kXGJOl8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}