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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f0fab5ed7cda5c9f24c48262ad43ffc3f2dfff9c6a41a814efe15ca77fbed5' 
  AND token = 'W0LX9rBwoG5e88AuRoKexq+dfgxgjGU1Y7prhZrEkqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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