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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2918d64db444a90c1f0bd868344ed4fe2a23ba425f741343b51289d5a5af70' 
  AND token = 'AabJNsB0NAP4iZ7STFf0QFIo9nHlXwqO3U/yQNkTy/A=' 
  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"
    }
  }
}