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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381318e1d0dc9cc6c4cbf40b9d599627fe6ec9c327204981ea4e6948e84ef4d0' 
  AND token = 'qcaZ/Q6bQJyKcVBskSQ/UaZ6dPB5ewmX/COYJ9g5a0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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