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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4426d21538a751968369881419d309f5f133516ace160aaeefea6f1080c0d2e3' 
  AND token = '0A5T9kYW+9vwe1tRYHREbNEJ8LLxGhCmyt9Hxb9B1HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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