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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576e00de56199bba1c6b1a34b019aca018042bd51e15ad57b56318de1391b82f' 
  AND token = 'ZwRF9Vq7eYa/BkU/eKy5rumNeUGQqhwGh+P4K6WZI3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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