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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4275b2f327dd4f96038285da0ead192eadb00e74894b782979b9b50b26c16dee' 
  AND token = 'NZW8VuKwv02kgFi4xlAUbQJQTpUHt+TwbPLk33tW8kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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