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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e01466fc2c5448208a2c923b715db000e358e29b1c8c02d6fd94a73465c7fe4' 
  AND token = 'eImEhPUyB1XFPNC/L17I7TFUl6WBA4Xgzdt0dERcW34=' 
  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"
    }
  }
}