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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30de73fe9f135a6291201afbfa09d8b7f10c3c9fccc901708a66ffa9a29052fc' 
  AND token = '2TOBGJuWEmSyE35VoFHG3HWQTmXeM4cwqyDQX183LRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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