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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b93d84e119c6de1e761ce7c668ec7c06cc170ead8984a2e36acd36803ab428' 
  AND token = '4MouqtG9cpKCrO3hg2Gg2ya9gK5BZRBsODS/jBYu2nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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