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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aff6819be45daea2a2a0a3f214da2fc20300c320a5d8869608a05422fe40c9e' 
  AND token = '5BQuzLIG3Hn49QhNw7XMI0uBKB2Qk2Kj1dLMDfQSv/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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