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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7d668185b3f93dc3164c5cde0a9ac4396bc58c34fc8e2592992a38e2ae2de2' 
  AND token = '1QM5HibeGXeAIZrAg8QMRaVR0LiUxwmAzqh/lgQkI84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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