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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a1abe4e5f596a7c2c7c200ace6188c0035ce42906e786195cc99b9254cd9e4' 
  AND token = 'qnOHBdcgxUdMJrzrTrk5Yiv7SaDSCjNAK8bSfUw8k5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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