SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2175d213b9743057de6c866f77ef4af78a3a9ca6f8a270573b536a341fdb2615' 
  AND token = 'qtX+8bBebgEQv1u/foLXUlwxdHZZ53ngVFQ34zfFbos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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