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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30477b5368956e3602ab61cb657a0a409a89b3698958b64a1594af1f10a8f721' 
  AND token = 'Tvt1FOiF98AwGMOF7snX4XROD+nO1X+JeqXINsLFI4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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