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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf8ae1fae9d87b6d2f2c865c1f437a7d57f862c8a1cedbf4e3851f5ab5a1389' 
  AND token = 'mZ2UbB3L4y/ThvYRSSNi+6HH7embVjnH8X6B74WoOMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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