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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1370b5825ca9b47f459798fdfc906485c0d37930cc5a17d042d6645b87152a6b' 
  AND token = 'udWfXEezJX5xxDNwmwAmobHsSIKsGfmCjRYi0CUWBU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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