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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce20d2f60b21467c54f1f2753df8cc412d1419effa3ebb1b2b5e79dab8fcc36' 
  AND token = 'PkQnfR8vhil8WYneheJwxh7xMAGp0MXrNZJzxsTa324=' 
  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"
    }
  }
}