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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a857292b2b25f4f3be774c539c919d0c8269c33cdc0e7ae027b4f0eef0c7de7c' 
  AND token = '6YDGg0HxwZTSScnEzwbsoQMy6vbSNgnsMGSYZsbTsKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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