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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1d42affc3dc16e6c7abd38e4739b883aa90530e62f6906ca72d42cc378952c' 
  AND token = 'OWDR0aSYvys7TUSMWh/8mooUyh3d+Y332U3TUODwdxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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