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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ff3da28e8f5ec7a59dfb02da0fb7688936350621f72f3de9ef0be00a6af726' 
  AND token = 'H12buMNdTKhjExYpG/BDiweLODMpP3sdgcovzCI1QUA=' 
  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"
    }
  }
}