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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85652f63bc83ec87aa556d252e8c6f88eaf6097b3d56049308fe67d1b454f6df' 
  AND token = '72L98bBdrZ1glO7wNTkGybycjDWssIFD2vN2S4l5Ins=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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