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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6b1787bfea755ae8d175a70fdc04dfc3ddcfa09ce9b10ab4a6ab52b4fa9dcf' 
  AND token = 'sk2XyO0/GqVBj5scH64FcGaBlNn27ZkYrnyuA2T+idc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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