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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ad3e89f9ddcdc9d830b214a206146fb4dc74c7fef6bdc8779fac29d120a9b5' 
  AND token = 'afOvPA9S/j14GbcnVLY2hTEWrgUcLBd/P/lhdqW7r8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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