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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ceed72a205fbe64484d84cc6651d2a3593e1c2c05d8abdc638e6a2a0770e247' 
  AND token = 'POE1Gc9LAEYtw0U2ysyZTdTDkhRVwMuuxwuJYzQuJ38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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