SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec262e29fc6f391d73ad49b24f8c6626c44552455dd9962f3a87f4af216f8cdd' 
  AND token = 'R7Repz5Cm45T/kM2xjLqleJScvXJNq+0bQu/KZVpKRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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