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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38ba6396786bdaa4ff571ebc7a27f2aea873b7b3d844cf2e0522d4dd5eedae6' 
  AND token = 'LRQfzDMwK3fYi87sWljGzoqklS8yPOXtMA2ZpWE7rQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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