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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d6e67bfac095194c2ed951753b177b20b163cc5fcdcc2e88addc13081acc7d' 
  AND token = 'dlYfoW+7J1VEpuELQoR1lyFSG/7YqMYCfCqqJ9Q99No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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