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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff9bf0c66f2eca63da3ba44e6164972af4ced64146a9745b3326942c0489106' 
  AND token = 'F0XM9tp0AFrZCmjlP/KLompQ3DtDmEJsGRKSGunDtD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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