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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48427fc5f1e91c00937509ccda071a63d5c65a50d594a56ec38810d21e0b257' 
  AND token = 'wjSPZgXqV76IIU3A9QlKaM6TrQwGHDaL2TLF1iDu3/w=' 
  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"
    }
  }
}