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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2c6443ace4f81ecc7da439041a68bdbf4ef7264d01e0c7cb264e0c7b489a9e' 
  AND token = 'ewPvovQCtO86sZJQw9+v4teNMTqH6yYiPq+NYurtvVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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