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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ecf6a89376e61da38e92d7b82716583f721456fac936ba1d677219832e02ca' 
  AND token = 'raC2n19sSBSa7kmLGcQYvkeqK4cGBnoITA0Lmk6t7z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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