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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37bd680c07835dbea0407f59c255c6f44f51830bf544e721d72b707710201c54' 
  AND token = 'DHERcr6Z+/hgdusPAprsYRbALgSkaW6jOcJi4FUaH2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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