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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f62c80fdaaa8d79d86cc956bb0c1e6c3a2efad66723d2ac465332f088eec5b' 
  AND token = 'uDReFU6PQ+QxwFsZEJutVCPLOEtFKcKlJJVYI4XeDYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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