Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67172d9a9e2eaf0aa4e8d98aca3d393c2d52cf7d56225b3db0346233c0f902a2' 
  AND token = 'YmnfBFUpGsJ3pADTCFeapZmMuQKSVbiZ3T7pfrcj+1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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