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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ccb18a5af1552b093c95986f21c64c1c48f5a69197c115ffedc61f83e04e4b' 
  AND token = 'D20fKsWZi2QUIlWRCNU6p4EOjufUQtDbWW4flfDDBJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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