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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54495e93f270b07bdd0220de2d085d2cb88039debe7e4a209f867b038f5a2b41' 
  AND token = 'NsJaxxlPlkXOhKSDGDGCXSzqAW+9b1F3jZpIMNHaa6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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