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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccd4613e953238fdf96e768da9fb2f75fe1e73e0d2b1eeea8bccebf712d2fbe' 
  AND token = 'OEf1EgXRYueGjHtlwMbBvTtJbXvpUhXUD2PTlmBquR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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