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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d226694f36ecc8630164c49bbc334f6866b73946e4f0fecb6942483409eff4f' 
  AND token = 'Yvzz/Yr2HfiIsN3rBVKY/USUC5xLOUoToiKqdJSAMGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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