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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b02bdac35be74443f5316057a60dc9d228a37b65c043878b07b8f557612ac1' 
  AND token = '612rwVAdnlv8zoaserVSB3uQr0xGhWHmYdpnCIJaA2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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