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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a96f34b9fbb53b8b4680d6769a104de0d449b5e4803ef9bf6a377c9b9b8db0' 
  AND token = '6UhkOovxx+1YuM/JStndIddLwCeClA10wt5SUry3Blo=' 
  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"
    }
  }
}