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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989bf32f28810272ea97baf8ad4b3a3b75dbb4537d130bbb80116d42eb6fd01d' 
  AND token = 'lHD9FrjKh57w1LduwyF1XqStzOIl7nee1iYmq/A/vD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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