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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154c3349fa95fc573d7dac7e58eddceaba0cc413d9b55a537207e33da926b384' 
  AND token = 'UnZHm7mCfQW6S3Dk+vm4pvr+lEcP9N+UxqtBNmhxyAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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