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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9128a3e0d677332b48272b3531008e339775af785e70a7d57cb8816339834f18' 
  AND token = 'yLNGfx/5BE/fWoWLK5X5Zd02ZYdQ/FQnfoMrnwAB6vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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