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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7c91e64b925cac8c84a8e0fea261d1e2d54be2b29ae7de899fbe428d0c846c' 
  AND token = '/7MePYc9osv69LCNKHN5xXsnuNHK95iPf7UeMFq1Pl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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