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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a03df814cc7acac7c05a444080ba876aaaadb1f9f51c198c466db3eebe13e1' 
  AND token = 'ddO1nnG/6jk1+0N79CyFxohsV+N5y8ObWA73urKF1l4=' 
  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"
    }
  }
}