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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ac9829933ca18b6ad3e28a6b698e43177b844501611616b8c160506bd828c2' 
  AND token = '3SI6gHszMBLjvMsAJJzSR3y/sDoXgGk2zgptDVijibE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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