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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67e69afcd15e5442e567d74366e1e96476b677ae1a5986d7842a01ffd6c7a56' 
  AND token = '07PyUfU+15oKQCIteaDn2MhdDgQG2/DQsGft+9pfTic=' 
  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"
    }
  }
}