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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e113369bd43befc75c0b6052a87dd3f8d843c53b11748717e2f155a36a400c' 
  AND token = 'iuL0XDjeTrMeKth7dkvZggBYq/4efiOAYqT4rEL772E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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