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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bc9203bf3f60f650e657f23d56ae7c2943c7012192b42c04a6ca8674ed9fc3' 
  AND token = '8KPTiji4KJEA+lg06cjpNBOvf7pppLIYAFn/rufdt7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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