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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33634e1c8cd1f19a976344d79584e8f42a607ac934b315df95be18567818f23d' 
  AND token = '3IOQf2yMdWXd+00+Wu7Fh0dE0SH2n7/O4TYPQ2y66HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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