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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a36b508a7d0f2ef8f312d7ca0c896db5fc3e8b8f9cfada5249685dbc35622a7' 
  AND token = 'QkZZiSleVkYbXgBpfNeJ5gu8bjZ3jvF46Zn03cpjC5M=' 
  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"
    }
  }
}