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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381c88092393ea8b3e4629ec78780dc46adb0f02cf0fed155a9dc42475a79001' 
  AND token = 'BgPpo7/QqiuS49z0Fmq6S7w91t05ulUEvMZhHSw6clY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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