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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c98e123bd306d413cf36e80ff33549ec9696c8cfff4b1b1f2a9c08e860e248' 
  AND token = 'q9Bn92/eatRZqDdnPPymZwVUuLlxYuC16rpMw1tuAaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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