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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853be8673a0f336c483d007e910f0c6a582eb754e0065a1e3d0c5f772650c620' 
  AND token = 'LT7aozYascg2r2bS9LKhGO9Up2QT/zy0xiGLuHQ1wqU=' 
  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"
    }
  }
}