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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e83999567fd08a445344229a824f9c8497544d639839a7a13d235054fe0f24' 
  AND token = 'l3Dc11pX+e3IC7lGJ+29wryAjTixj/vWtJrRU0kryHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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