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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7019ac85dd8d21efbf1fe7812f3cae87970c1849c63e57699eebf78d7d27d417' 
  AND token = 'o+pgcOBzh4srseBlz+B2tT0wKlvxjyg4zwRBZp5SOyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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