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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e014e8d6f56bb6e0ddd4ee2a35875571d43e32bf6bd43087489c3293ba6c2234' 
  AND token = 'XyIdN0J+0iaxAq2EozkrOnvA7QPFhls3vNvl5sbkbMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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