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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1395e5359fd46f9ec485284502429c18fda5b360bf77e97702b640fb5695efa2' 
  AND token = 'A+U/esEilLS0yZEaYcuiP2YSeg4R1dq20JKEtcMHAbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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