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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f6b817dde56f0ddcc8c739c027fd7ea5b2fc0d4119d287b3a41e4fb133be8f' 
  AND token = '0d7y7SS+Do4HQbOln+WRv662EsF484ork8u1Xw1Cwvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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