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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c59c68dbc9d865351027455a99077bc30975ecb4e3b4a876a275e5c4caa4140' 
  AND token = 'Br5mv2W0+NtlxFp5PrRKajVnBHY+HO48eZmdHSxPw14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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